﻿<!DOCTYPE html>
<html>
<head>
  <title>Curviness</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="Links with different amounts of curviness." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
        {
          "undoManager.isEnabled": true
        });

      // define a simple Node template
      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          new go.Binding("position", "position"),
          $(go.Shape, "RoundedRectangle",
            // Shape.fill is bound to Node.data.color
            new go.Binding("fill", "color")),
          $(go.TextBlock,
            { margin: 3 },  // some room around the text
            // TextBlock.text is bound to Node.data.key
            new go.Binding("text", "key"))
        );

      myDiagram.linkTemplate =
        $(go.Link, go.Link.Bezier,
          // when using fromSpot/toSpot:
          { fromSpot: go.Spot.Left, toSpot: go.Spot.Left },
          new go.Binding("fromEndSegmentLength", "curviness"),
          new go.Binding("toEndSegmentLength", "curviness"),

          // if not using fromSpot/toSpot, use a binding to curviness instead:
          //new go.Binding("curviness", "curviness"),

          $(go.Shape,  // the link shape
            { stroke: "black", strokeWidth: 1.5 }),

          $(go.Shape,  // the arrowhead, at the mid point of the link
            { toArrow: "OpenTriangle", segmentIndex: -Infinity })
        );

      // create the model data that will be represented by Nodes and Links
      myDiagram.model = new go.GraphLinksModel(
        [
          { position: new go.Point(100, 100), key: "Alpha", color: "lightblue" },
          { position: new go.Point(100, 200), key: "Beta", color: "orange" },
          { position: new go.Point(100, 300), key: "Gamma", color: "lightgreen" },
          { position: new go.Point(100, 400), key: "Delta", color: "pink" }
        ],
        [
          // The links have different curviness values.
          // Set by hand here, they are larger when the two nodes are farther away
          { from: "Alpha", to: "Beta", curviness: 20 },
          { from: "Alpha", to: "Gamma", curviness: 40 },
          { from: "Gamma", to: "Delta", curviness: 20 },
          { from: "Delta", to: "Alpha", curviness: 60 }
        ]);
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:500px; height:500px"></div>
  <p>
    This sample explicitly binds the <a>Link.curviness</a> property, so that some links bend out farther than others.
  </p>
  <p>
    The link template also places an arrowhead at the middle of the link,
    by explicitly setting the arrowhead's <a>GraphObject.segmentIndex</a> to -Infinity
    <i>after</i> setting <a>Shape.toArrow</a>.
  </p>
</div>
</body>
</html>
